Stomatal indices of Peltaspermum martinsii (Pteridospermopsida, Peltaspermaceae) from the Upper Permian Bletterbach Gorge and their possible applicability as CO2 proxies
Stomatal indices of Peltaspermum martinsii (Pteridospermopsida, Peltaspermaceae) from the Upper Permian Bletterbach Gorge and their possible applicability as CO2 proxies
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